Re: using tie on hash of hashes

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Re: Re: using tie on hash of hashes by rob_au (Abbot) on Aug 17, 2002 at 14:57 UTC
++Anonymous Monk ... One important thing to note about tied hashes with MLDBM though is that the value of a hash should be copied to a temporary variable prior to its manipulation. From the BUGS section of the module POD ... `$mldb{key}{subkey}[3] = 'stuff'; # won't work tmp = $mldb{key}; # retrieve value $tmp->{subkey}[3] = 'stuff'; $mldb{key} = $tmp; # store value` [download] This limitation exists as a result of the Perl TIEHASH interface having no support for multidimensional ties. I wrote about this topic in a more general way in The importance of context in debugging.	[reply] [d/l]

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Re: Re: using tie on hash of hashes
by rob_au (Abbot) on Aug 17, 2002 at 14:57 UTC

$mldb{key}{subkey}[3] = 'stuff';        # won't work

tmp = $mldb{key};                       # retrieve value
$tmp->{subkey}[3] = 'stuff';
$mldb{key} = $tmp;                      # store value
[download]

This limitation exists as a result of the Perl TIEHASH interface having no support for multidimensional ties. I wrote about this topic in a more general way in The importance of context in debugging.

[reply]
[d/l]